Return-Path: <13brv3@bellsouth.net> Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3081190 for flyrotary@lancaironline.net; Tue, 16 Mar 2004 10:50:50 -0500 Received: from rad ([68.221.170.60]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040316155050.QZFY4640.imf23aec.mail.bellsouth.net@rad> for ; Tue, 16 Mar 2004 10:50:50 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: More run time, fewer issues Date: Tue, 16 Mar 2004 09:48:38 -0600 Message-ID: <003b01c40b6e$2d3f0770$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003C_01C40B3B.E2A49770" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_003C_01C40B3B.E2A49770 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Thats a great thought, Kelly. I'll see if I can dig up the rest of the stock oil line. I don't believe the stock turbo had a restrictor in the line, but I seem = to recall that there was a difference in the in, and out port on the turbo itself. In other words, the orifice in the top (in) port was smaller in diameter than the bottom (out), which would act as a restrictor to some extent. =20 =20 The biggest problem with turbo oil lines is usually the return. These bearings can not be pressurized. The return line should be large = diameter, and gravity fed to the engine. The typical Mazda return is a large = diameter steel pipe, to allow the frothy oil to easily return to the engine. =20 =20 Did you get creative with the orientation of the turbo, or is it mounted using the stock manifold? =20 =20 And another thing- where are our pictures? We like pictures :-)=20 Speaking of oil pressure. I have 70+ psi on engine start and warm up, = but after the oil gets hot the oil pressure drops into the 30's as soon as I throttle back. Is this normal? =20 That's probably OK. I think 30 is about the spec for idle, but I = realize you aren't doing any real idling. I believe the oil pressure spring is normally set at 60 psi, and you'd expect it to be a bit higher when the = oil is cold and thick. =20 Cheers, Rusty =20 ------=_NextPart_000_003C_01C40B3B.E2A49770 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

Thats a great thought, Kelly.  I'll see if I can = dig up the=20 rest of the stock oil line.

I don't = believe the=20 stock turbo had a restrictor in the line, but I seem to recall = that there=20 was a difference in the in, and out port on the turbo itself.  In = other=20 words, the orifice in the top (in) port was smaller in diameter than the = bottom=20 (out), which would act as a restrictor to some extent. =20
 
The = biggest problem with=20 turbo oil lines is usually the return.  These bearings can not be=20 pressurized.  The return line should be large diameter, and = gravity=20 fed to the engine.  The typical Mazda return is a large = diameter steel=20 pipe, to allow the frothy oil to easily return to the=20 engine.  
 
Did you=20 get creative with the orientation of the turbo, or is it=20 mounted using the stock manifold?  
 
And = another thing- where=20 are our pictures?  We like pictures :-) 


Speaking of oil pressure.  I have 70+ psi on engine = start and=20 warm up, but after the oil gets hot the oil pressure drops into the 30's = as soon=20 as I throttle back.  Is this normal?
 
That's probably = OK.  I think 30=20 is about the spec for idle, but I realize you aren't doing any real=20 idling.  I believe the oil pressure spring is normally set at 60 = psi, and=20 you'd expect it to be a bit higher when the oil is cold and = thick.
 
Cheers,
Rusty

 
 ------=_NextPart_000_003C_01C40B3B.E2A49770--